package com.apimarket.security;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.security.SecurityProperties;
import org.springframework.security.access.SecurityMetadataSource;
import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
import org.springframework.security.access.intercept.InterceptorStatusToken;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;
import org.springframework.stereotype.Service;

import javax.servlet.*;
import java.io.IOException;


/**
 * @Description:权限拦截器
 *   在自定义的SecurityMetadataSource编写好之后，还要编写一个拦截器，增加到Spring security默认的拦截器链中，以达到拦截的目的
 * @Author ZXR
 * @Date 2021/7/20 19:43
 * @Version 1.0
 * 这里在指定tomcat版本不对导致SpringSecurity接收不到参数的时候加上了abstract
 */
@Service
public class CustomizeAbstractSecurityInterceptor extends AbstractSecurityInterceptor implements Filter{
    @Autowired
    private FilterInvocationSecurityMetadataSource securityMetadataSource;
    @Autowired
    public void setMyAccessDecisionManager(CustomizeAccessDecisionManager accessDecisionManager) {
        super.setAccessDecisionManager(accessDecisionManager);
    }

    @Override
    public Class<?> getSecureObjectClass() {
        return FilterInvocation.class;
    }

    @Override
    public SecurityMetadataSource obtainSecurityMetadataSource() {
        return this.securityMetadataSource;
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        FilterInvocation fi = new FilterInvocation(request, response, chain);
        invoke(fi);
    }
    public void invoke(FilterInvocation fi) throws IOException, ServletException {
        //fi里面有一个被拦截的url
        //里面调用MyInvocationSecurityMetadataSource的getAttributes(Object object)这个方法获取fi对应的所有权限
        //再调用MyAccessDecisionManager的decide方法来校验用户的权限是否足够
        InterceptorStatusToken token = super.beforeInvocation(fi);
        try{
            //执行下一个拦截器
            fi.getChain().doFilter(fi.getRequest(),fi.getResponse());
        }finally{
            super.afterInvocation(token,null);
        }
    }
}
